The code that causes behavior reported in Comment #4 (at least in Trisquel):
cat /var/lib/dpkg/info/lightdm.config
# set default display manager
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager
[...]
# debconf is not a registry; use the current contents of the default display
# manager file to pre-answer the question if possible
if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
CURRENT_DEFAULT=$(basename "$(grep -v '^[[:space:]]*#' \
"$DEFAULT_DISPLAY_MANAGER_FILE" |
head -n 1)")
if [ -n "$CURRENT_DEFAULT" ]; then
db_set shared/default-x-display-manager "$CURRENT_DEFAULT"
fi
else
CURRENT_DEFAULT=
if db_get shared/default-x-display-manager; then
CURRENT_DEFAULT="$RET"
fi
fi
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https://bugs.launchpad.net/bugs/1020770
Title:
gdm install prompts about dm when debconf value set
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